My sim eval was about a year and half ago (wow time flies) and it was a very positive experiance. (I got the job so it must have been good enough!).

The evaluators were very laid back and non-confrontational. (NJ) They give you about 1/2 hour so go over the profile by yourself and then they get you and take you to the sim. The guy in the right seat (you have a choice) gave me a few quick pointers on how to fly the sim. (Thrust lever angles, handling quirks etc) They told me they do not expect a perfect ride but they do expect that you make any errors you make to be corrected positively.

The sim ride went by very quickly and when it was over they took you down to KDs office to the handshake and "you'll hear from us". I went back to the airport and by the time I had gotten off the plane in EWR my sponsor knew and offered me the position.